Which of the following spillways is least suitable for an earthen dam ?

Related Mcqs:

1. Seepage through foundation in an earthen dam is controlled by providing___________________?

   A. rock toe
   B. horizontal blanket
   C. impervious cut off
   D. chimney drain

2. For the upstream face of an earthen dam, the most adverse condition for stability of slope is_______________?

   A. sudden drawdown
   B. steady seepage
   C. during construction
   D. sloughing of slope

3. Seepage through embankments in an earthen dam is controlled by_______________?

   A. drainage filters
   B. relief wells
   C. drain trenches
   D. provision of downstream berms

4. As compared to gravity dams, earthen dams__________________?

   A. are costlier
   B. are less susceptible to failure
   C. require sound rock foundations
   D. require less skilled labour

5. The most suitable material for the central impervious core of a zoned embankment type dam is_______________?

   A. clay
   B. coarse sand
   C. silty clay
   D. clay mixed with fine sand

6. When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________?

   A. 0 and wH212
   B. wH2/2and wH2/3
   C. wH and 0
   D. OandwII

   where w is unit weight of water and H is the depth of water

7. When the reservoir is full, the maximum compressive force in a gravity dam is produced______________?

   A. at the toe
   B. at the heel
   C. within the middle third of base
   D. at centre of base

8. The maximum permissible eccentricity for no tension at the base of a gravity dam is__________________?

   A. B/2
   B. B/3
   C. B/4
   D. B/6

9. The major resisting force in a gravity dam is___________________?

   A. water pressure
   B. wave pressure
   C. self-weight of dam
   D. uplift pressure

10. The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?

    1) Water pressure
    2) Self weight
    3) Uplift
    4) Pressure due to earthquake
    The correct answer is

    A. Only (2)
    B. (1), (2) and (3)
    C. (1), (2) and (4)
    D. (1), (2), (3) and (4)